Vaccine

Vaccine

Genaro Molina / Los Angels Times

Carlos de la Rosa, 53, chief conservation and education officer with the Catalina Island Conservancy, holds a test dart that will be used to inject the contraceptive vaccine porcine zona pellucida into female bison. He is one of three biologists that will be overseeing the process.

Carlos de la Rosa, 53, chief conservation and education officer with the Catalina Island Conservancy, holds a test dart that will be used to inject the contraceptive vaccine porcine zona pellucida into female bison. He is one of three biologists that will be overseeing the process. (Genaro Molina / Los Angels Times)

Carlos de la Rosa, 53, chief conservation and education officer with the Catalina Island Conservancy, holds a test dart that will be used to inject the contraceptive vaccine porcine zona pellucida into female bison. He is one of three biologists that will be overseeing the process.